/Engine/Plugins/Editor/DataValidation/Source/DataValidation/Public/EditorValidatorSubsystem.h
Adds a validator to the list, making sure it is a unique instance
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, Category="Validation") void AddValidator ( [UEditorValidatorBase](API\Plugins\DataValidation\UEditorValidatorBase) * InValidator )